When old computers reach the end of their useful life within an organisation, many an IT professional immediately has thoughts of charity on their mind and donating an old computer means someone else can use it to gain skills or keep in contact with the outside world.
However, this is not without its problems. No-one in their right mind would donate the CEO's old desktop without deleting important data such as financial records or confidential emails. Reformatting the disk does not erase this data permanently.